fix(ui-ux): allow adding of dusd collateral with active dusd loan

[lykalabrada]

What this PR does / why we need it:

Allow adding of DUSD collateral to a vault with active DUSD loan

To borrow DUSD token:

• Vault should have DFI collateral > 50% (of loan value)
• Vault has 100% DUSD collateral (newly added when dusd-loop is enabled)

To borrow non-DUSD tokens:

• Vault should have DFI collateral > 50% of loan value
• Vault should have DUSD collateral > 50% of loan value

When adding collateral:

• Adding of DUSD collateral to a vault with both DFI and DUSD collaterals should be allowed
• Adding of non-DUSD collateral to a vault with an active DUSD loan, containing 100% DUSD collateral should not be allowed

Which issue(s) does this PR fixes?:

Fixes #4130

Additional comments?:

Developer Checklist:

• [ ] Read your code changes at least once
• [ ] Tested on iOS/Android device (e.g, No crashes, library supported etc.)
• [ ] No console errors on web
• [ ] Tested on Light mode and Dark mode*
• [ ] Your UI implementation visually matched the rendered design*
• [ ] Unit tests*
• [ ] Added e2e tests*
• [ ] Added translations*

[github-actions[bot]]

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[github-actions[bot]]

Build preview for DeFiChain Wallet is ready!

Built with commit cb71075c263d40a98ad97e3860d1830feb9bc083

https://expo.io/@defichain/wallet?release-channel=pr-preview-4131

[codecov-commenter]

Codecov Report

Merging #4131 (0d8cec3) into main (f29a056) will decrease coverage by 6.10%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #4131      +/-   ##
==========================================
- Coverage   61.38%   55.28%   -6.10%     
==========================================
  Files         438      438              
  Lines       12356    12348       -8     
  Branches     4091     4085       -6     
==========================================
- Hits         7585     6827     -758     
- Misses       4680     5438     +758     
+ Partials       91       83       -8     

Files	Coverage Δ
...eens/Loans/screens/AddOrRemoveCollateralScreen.tsx	57.00% <0.00%> (+2.05%)	:arrow_up:

... and 47 files with indirect coverage changes

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